Process for detoxification

Details Process for detoxification Process for detoxification

1981-12-07

1983-11-29

Castel, Benoit

Liquid purification or separation

Processes

Chemical treatment

210904, C02F 172

Patent

active

044179871

ABSTRACT:
When aqueous solutions of a metal cyanide complex are detoxified with hydrogen peroxide, a residue of cyanide remains, which in the case of nickel for example may be present as Ni(CN).sub.2. In a process according to the present invention the detoxification of aqueous alkaline solutions of a metal cyanide complex is carried out using a restricted amount of certain complexing agents together with the hydrogen peroxide. A particularly suitable example of such complexing agents is ethylenediaminotetraacetic acid. It is especially preferred to use the complexing agent in a mole ratio to metal of from 0.8:1 to 1.5:1, together with hydrogen peroxide in a mole ratio to cyanide of from 2:1 to 3:1. The process is well suited to the treatment of concentrated solutions of cyanide, in many cases at least 4000 ppm, for example those resulting from the stripping of nickel plating.

REFERENCES:
patent: 3617567 (1971-11-01), Mathre
patent: 3843516 (1974-10-01), Yamada et al.
patent: 3970554 (1976-07-01), Fischer et al.

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